{"product_id":"oyster-shell-calcium-w-magnesium-vit-d-3-tablets","title":"Oyster Shell Calcium w\/ Magnesium \u0026 Vitamin D-3 - 2 Sizes \/ 100 \u0026 200 Tabs","description":"\u003cp style=\"text-align:center; font-size:22px; font-weight:bold; color:#000; margin:24px 0;\"\u003e\nOyster Shell Calcium + Magnesium + Vitamin D — Synergistic Mineral Support for Strong Bones \u0026amp; Muscles*\n\u003c\/p\u003e\n\n\u003cp style=\"font-size:20px; color:#000;\"\u003e\nLifeSource Vitamins combines naturally derived oyster shell calcium (calcium carbonate) with essential magnesium and vitamin D₃ to support bone mineralization, calcium absorption, and healthy muscle function. Produced in GMP-certified facilities and \u003ca href=\"https:\/\/lifesourcevitamins.com\/pages\/3rd-party-testing\" target=\"_blank\" rel=\"noopener\"\u003e\u003cstrong\u003e3rd-party tested\u003c\/strong\u003e\u003c\/a\u003e for identity, purity \u0026amp; potency.*\n\u003c\/p\u003e\n\n\u003cdiv style=\"background:#eef7ff; border-left:4px solid #0073cf; border-radius:8px; padding:16px 18px; margin:18px 0 22px 0; text-align:center;\"\u003e\n\u003cstrong style=\"font-size:20px; color:#000;\"\u003eResearch-Driven \u0026amp; Verified Product.\u003c\/strong\u003e\u003cbr\u003e\n\u003cspan style=\"font-size:20px; color:#000;\"\u003eExplore the clinical research, ingredient science, and global evidence supporting this product below.\u003c\/span\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"background:#f3fff5; border:2px solid #2e9b4c; border-radius:14px; padding:14px; margin:22px 0; font-size:20px; color:#000;\"\u003e\n\u003cstrong\u003eResearch Promise:\u003c\/strong\u003e At LifeSource Vitamins, our commitment is rooted in research and results. Every benefit below is based on human studies verified by the \u003cstrong\u003eNational Institutes of Health (NIH)\u003c\/strong\u003e, a world-leading health authority, plus insights from \u003cstrong\u003e39 clinically respected organizations\u003c\/strong\u003e and \u003cstrong\u003e20 globally renowned health-focused universities\u003c\/strong\u003e.*\n\u003c\/div\u003e\n\n\u003cdiv style=\"background:#f2f4f7; border:1px solid #d0d7de; border-radius:14px; padding:16px; margin:22px 0 12px 0; font-size:20px; font-weight:bold; color:#000;\"\u003e\nClinically Studied Benefits\n\u003c\/div\u003e\n\n\u003cp style=\"font-size:20px; color:#000; margin:0 0 20px 34px; line-height:1.75;\"\u003e\n✓ \u003cstrong\u003eVitamin D Enables Calcium Absorption\u003c\/strong\u003e — Vitamin D promotes intestinal calcium absorption and maintains serum calcium for bone mineralization.\n\u003cspan style=\"font-size:18px; color:#555; font-style:italic;\"\u003e\n\u003ca href=\"https:\/\/ods.od.nih.gov\/factsheets\/VitaminD-HealthProfessional\/\" target=\"_blank\" rel=\"noopener\"\u003eNIH\/ODS, 2024\u003c\/a\u003e\n\u003c\/span\u003e\n\u003c\/p\u003e\n\u003cp style=\"font-size:20px; color:#000; margin:0 0 20px 34px; line-height:1.75;\"\u003e\n✓ \u003cstrong\u003eCalcium is Essential for Bone Structure \u0026amp; Function\u003c\/strong\u003e — Adequate calcium supports skeletal integrity; absorption occurs via active transport and diffusion.\n\u003cspan style=\"font-size:18px; color:#555; font-style:italic;\"\u003e\n\u003ca href=\"https:\/\/ods.od.nih.gov\/factsheets\/Calcium-HealthProfessional\/\" target=\"_blank\" rel=\"noopener\"\u003eNIH\/ODS, 2024\u003c\/a\u003e\n\u003c\/span\u003e\n\u003c\/p\u003e\n\u003cp style=\"font-size:20px; color:#000; margin:0 0 20px 34px; line-height:1.75;\"\u003e\n✓ \u003cstrong\u003eMagnesium Supports Bone Formation \u0026amp; Vitamin D Metabolism\u003c\/strong\u003e — Magnesium influences osteoblast\/osteoclast activity and vitamin D regulation; higher intakes correlate with better BMD.\n\u003cspan style=\"font-size:18px; color:#555; font-style:italic;\"\u003e\n\u003ca href=\"https:\/\/ods.od.nih.gov\/factsheets\/Magnesium-HealthProfessional\/\" target=\"_blank\" rel=\"noopener\"\u003eNIH\/ODS, 2024\u003c\/a\u003e\n\u003c\/span\u003e\n\u003c\/p\u003e\n\u003cp style=\"font-size:20px; color:#000; margin:0 0 20px 34px; line-height:1.75;\"\u003e\n✓ \u003cstrong\u003eCalcium + Vitamin D: Fracture Outcomes (WHI)\u003c\/strong\u003e — In the Women’s Health Initiative (36,282 women), Ca + D modestly improved hip BMD; hip-fracture reduction was not significant overall, with increased kidney-stone risk noted.\n\u003cspan style=\"font-size:18px; color:#555; font-style:italic;\"\u003e\n\u003ca href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/16481635\/\" target=\"_blank\" rel=\"noopener\"\u003eNIH\/PubMed — Jackson, 2006\u003c\/a\u003e\n\u003c\/span\u003e\n\u003c\/p\u003e\n\u003cp style=\"font-size:20px; color:#000; margin:0 0 20px 34px; line-height:1.75;\"\u003e\n✓ \u003cstrong\u003eMeta-Analysis: Ca + D Lowers Total \u0026amp; Hip Fractures\u003c\/strong\u003e — Pooled RCTs show 15% fewer total fractures and 30% fewer hip fractures with Ca + D versus control.\n\u003cspan style=\"font-size:18px; color:#555; font-style:italic;\"\u003e\n\u003ca href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC4715837\/\" target=\"_blank\" rel=\"noopener\"\u003eNIH\/PMC — Weaver, 2015\u003c\/a\u003e\n\u003c\/span\u003e\n\u003c\/p\u003e\n\u003cp style=\"font-size:20px; color:#000; margin:0 0 20px 34px; line-height:1.75;\"\u003e\n✓ \u003cstrong\u003eClinical Guidance Nuances\u003c\/strong\u003e — USPSTF finds no net benefit for low-dose Ca ≤ 1,000 mg + D ≤ 400 IU for primary fracture prevention in community-dwelling older adults; dosing and population matter.\n\u003cspan style=\"font-size:18px; color:#555; font-style:italic;\"\u003e\n\u003ca href=\"https:\/\/www.uspreventiveservicestaskforce.org\/uspstf\/recommendation\/vitamin-d-calcium-or-combined-supplementation-for-the-primary-prevention-of-fractures-in-adults-preventive-medication\" target=\"_blank\" rel=\"noopener\"\u003eUSPSTF, 2021\u003c\/a\u003e\n\u003c\/span\u003e\n\u003c\/p\u003e\n\u003cp style=\"font-size:20px; color:#000; margin:0 0 20px 34px; line-height:1.75;\"\u003e\n✓ \u003cstrong\u003eMarine-Source Calcium Viability\u003c\/strong\u003e — Reviews support marine-derived calcium (including shell sources) as a viable supplemental calcium form.\n\u003cspan style=\"font-size:18px; color:#555; font-style:italic;\"\u003e\n\u003ca href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC7595125\/\" target=\"_blank\" rel=\"noopener\"\u003eNIH\/PMC — Fairweather-Tait, 2020\u003c\/a\u003e\n\u003c\/span\u003e\n\u003c\/p\u003e\n\u003cp style=\"font-size:20px; color:#000; margin:0 0 20px 34px; line-height:1.75;\"\u003e\n✓ \u003cstrong\u003eOyster-Shell Calcium in Deficiency\u003c\/strong\u003e — Oyster-shell calcium electrolysate improved serum calcium in vitamin D-deficient individuals.\n\u003cspan style=\"font-size:18px; color:#555; font-style:italic;\"\u003e\n\u003ca href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/2268740\/\" target=\"_blank\" rel=\"noopener\"\u003eNIH\/PubMed — Reichel, 1990\u003c\/a\u003e\n\u003c\/span\u003e\n\u003c\/p\u003e\n\u003cp style=\"font-size:20px; color:#000; margin:0 0 20px 34px; line-height:1.75;\"\u003e\n✓ \u003cstrong\u003eHow to Take Calcium Carbonate\u003c\/strong\u003e — Calcium carbonate is best absorbed with food; small split doses (≤500 mg at a time) improve uptake.\n\u003cspan style=\"font-size:18px; color:#555; font-style:italic;\"\u003e\n\u003ca href=\"https:\/\/www.mayoclinic.org\/healthy-lifestyle\/nutrition-and-healthy-eating\/expert-answers\/calcium-supplements\/faq-20058238\" target=\"_blank\" rel=\"noopener\"\u003eMayo Clinic, 2024\u003c\/a\u003e\n\u003c\/span\u003e\n\u003c\/p\u003e\n\u003cp style=\"font-size:20px; color:#000; margin:0 0 20px 34px; line-height:1.75;\"\u003e\n✓ \u003cstrong\u003eBone-Health Basics \u0026amp; Dosing Context\u003c\/strong\u003e — Clinical guidance reiterates vitamin D’s role in calcium absorption and adult RDAs.\n\u003cspan style=\"font-size:18px; color:#555; font-style:italic;\"\u003e\n\u003ca href=\"https:\/\/www.mayoclinic.org\/healthy-lifestyle\/adult-health\/in-depth\/bone-health\/art-20045060\" target=\"_blank\" rel=\"noopener\"\u003eMayo Clinic, 2024\u003c\/a\u003e\n\u003c\/span\u003e\n\u003c\/p\u003e\n\n\u003cdiv style=\"background:#f2f4f7; border:1px solid #d0d7de; border-radius:14px; padding:16px; margin:22px 0 12px 0; font-size:20px; font-weight:bold; color:#000;\"\u003e\nAdditional \/ Promising Evidence\n\u003c\/div\u003e\n\n\u003cp style=\"font-size:20px; color:#000; margin:0 0 20px 34px; line-height:1.75;\"\u003e\n✓ \u003cstrong\u003eMay Reduce Long-Term Hip-Fracture Risk with Adherence\u003c\/strong\u003e — Long-term Ca + D in WHI subset analyses suggests potential hip-fracture risk reduction with adherence; kidney-stone risk increased.\n\u003cspan style=\"font-size:18px; color:#555; font-style:italic;\"\u003e\n\u003ca href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/23208074\/\" target=\"_blank\" rel=\"noopener\"\u003eNIH\/PubMed — Prentice, 2013\u003c\/a\u003e\n\u003c\/span\u003e\n\u003c\/p\u003e\n\u003cp style=\"font-size:20px; color:#000; margin:0 0 20px 34px; line-height:1.75;\"\u003e\n✓ \u003cstrong\u003eOngoing NIH Communications Reinforce Trio’s Roles\u003c\/strong\u003e — Reinforces the roles of Ca, D, and Mg in bone health.\n\u003cspan style=\"font-size:18px; color:#555; font-style:italic;\"\u003e\n\u003ca href=\"https:\/\/ods.od.nih.gov\/pubs\/The_Scoop_May_2024.pdf\" target=\"_blank\" rel=\"noopener\"\u003eNIH\/ODS, 2024\u003c\/a\u003e\n\u003c\/span\u003e\n\u003c\/p\u003e\n\u003cp style=\"font-size:20px; color:#000; margin:0 0 20px 34px; line-height:1.75;\"\u003e\n✓ \u003cstrong\u003ePopulation Data Link Magnesium to BMD\u003c\/strong\u003e — Higher magnesium intake correlates with better bone mineral density; small trials suggest bone-turnover effects.\n\u003cspan style=\"font-size:18px; color:#555; font-style:italic;\"\u003e\n\u003ca href=\"https:\/\/ods.od.nih.gov\/factsheets\/Magnesium-HealthProfessional\/\" target=\"_blank\" rel=\"noopener\"\u003eNIH\/ODS, 2024\u003c\/a\u003e\n\u003c\/span\u003e\n\u003c\/p\u003e\n\u003cp style=\"font-size:20px; color:#000; margin:0 0 20px 34px; line-height:1.75;\"\u003e\n✓ \u003cstrong\u003eClinical Advice on Calcium Utility\u003c\/strong\u003e — Combine adequate intake, vitamin D status, and split dosing for best calcium utility.\n\u003cspan style=\"font-size:18px; color:#555; font-style:italic;\"\u003e\n\u003ca href=\"https:\/\/www.mayoclinic.org\/healthy-lifestyle\/nutrition-and-healthy-eating\/in-depth\/calcium-supplements\/art-20047097\" target=\"_blank\" rel=\"noopener\"\u003eMayo Clinic, 2024\u003c\/a\u003e\n\u003c\/span\u003e\n\u003c\/p\u003e\n\u003cp style=\"font-size:20px; color:#000; margin:0 0 20px 34px; line-height:1.75;\"\u003e\n✓ \u003cstrong\u003eRegulatory Perspective on Low-Dose Ca+D\u003c\/strong\u003e — Low-dose Ca+D not effective for primary fracture prevention in general older-adult populations.\n\u003cspan style=\"font-size:18px; color:#555; font-style:italic;\"\u003e\n\u003ca href=\"https:\/\/www.uspreventiveservicestaskforce.org\/uspstf\/draft-recommendation\/vitamin-d-calcium-combined-supplementation-primary-prevention-falls-fractures-communitydwelling-adults\" target=\"_blank\" rel=\"noopener\"\u003eUSPSTF, 2024\u003c\/a\u003e\n\u003c\/span\u003e\n\u003c\/p\u003e\n\u003cp style=\"font-size:20px; color:#000; margin:0 0 20px 34px; line-height:1.75;\"\u003e\n✓ \u003cstrong\u003eQuality Note on Lead Contamination\u003c\/strong\u003e — Some natural-source calcium supplements historically contained lead; rigorous testing is important.\n\u003cspan style=\"font-size:18px; color:#555; font-style:italic;\"\u003e\n\u003ca href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/10989406\/\" target=\"_blank\" rel=\"noopener\"\u003eNIH\/PubMed — Ross, 2000\u003c\/a\u003e\n\u003c\/span\u003e\n\u003c\/p\u003e\n\n\u003cdiv style=\"background:#f2f4f7; border:1px solid #d0d7de; border-radius:14px; padding:16px; margin:22px 0 12px 0; font-size:20px; font-weight:bold; color:#000;\"\u003e\nUniversity-Led \u0026amp; Academic Studies\n\u003c\/div\u003e\n\n\u003cp style=\"font-size:20px; color:#000; margin:0 0 20px 34px; line-height:1.75;\"\u003e\n✓ \u003cstrong\u003eEarly research on magnesium’s role in vitamin D metabolism\u003c\/strong\u003e.\n\u003cspan style=\"font-size:18px; color:#555; font-style:italic;\"\u003e\n\u003ca href=\"https:\/\/ods.od.nih.gov\/factsheets\/Magnesium-HealthProfessional\/\" target=\"_blank\" rel=\"noopener\"\u003eNIH\/ODS, 2024\u003c\/a\u003e\n\u003c\/span\u003e\n\u003c\/p\u003e\n\n\u003cdiv style=\"background:#f2f4f7; border:1px solid #d0d7de; border-radius:14px; padding:16px; margin:22px 0 12px 0; font-size:20px; font-weight:bold; color:#000;\"\u003e\nGlobal Evidence \u0026amp; Reviews\n\u003c\/div\u003e\n\n\u003cp style=\"font-size:20px; color:#000; margin:0 0 20px 34px; line-height:1.75;\"\u003e\n✓ \u003cstrong\u003eWHO \/ NCCIH \/ EFSA \/ EMA \/ ABC \/ USP\u003c\/strong\u003e — Global reviews support the use of calcium, magnesium, and vitamin D for bone health and mineral balance.\n\u003cspan style=\"font-size:18px; color:#555; font-style:italic;\"\u003e\nMultiple authoritative sources\u003c\/span\u003e\n\u003c\/p\u003e\n\n\u003cdiv style=\"background:#f3fff5; border:2px solid #2e9b4c; border-radius:14px; padding:14px; margin:22px 0; font-size:20px; color:#000;\"\u003e\n\u003cstrong\u003eWe monitor research from leading institutions —\u003c\/strong\u003e\nHarvard, Johns Hopkins, Mayo Clinic, Cleveland Clinic, Cambridge, Oxford, Stanford, Yale, Tufts, University of Florida, Oregon State University – Linus Pauling Institute, Columbia, Cornell, Ohio State — to align with credible science.*\n\u003c\/div\u003e\n\n\u003cdiv style=\"background:#eef7ff; border:2px solid #0073cf; border-radius:14px; padding:14px; margin:22px 0; text-align:center; font-size:20px;\"\u003e\n\u003ca href=\"https:\/\/lifesourcevitamins.com\/search?q=calcium\" target=\"_blank\" rel=\"noopener\" style=\"color:#0073cf !important; text-decoration:none;\"\u003e\n\u003cstrong\u003eShop More LifeSource Vitamins Calcium \u0026amp; Mineral Supplements\u003c\/strong\u003e\n\u003c\/a\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"background:#f2f4f7; border:1px solid #d0d7de; border-radius:14px; padding:16px; margin:22px 0 12px 0; font-size:20px; font-weight:bold; color:#000;\"\u003e\nKey Ingredients\n\u003c\/div\u003e\n\n\u003cul style=\"font-size:20px; color:#000; line-height:1.55; margin:0 0 32px 34px;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eOyster Shell Calcium (Calcium Carbonate)\u003c\/strong\u003e — Provides bioavailable calcium for bone structure and function.*\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMagnesium\u003c\/strong\u003e — Supports bone formation, vitamin D metabolism, and muscle function.*\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVitamin D₃\u003c\/strong\u003e — Enables calcium absorption and bone mineralization.*\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cdiv style=\"background:#f2f4f7; border:1px solid #d0d7de; border-radius:14px; padding:16px; margin:22px 0 12px 0; font-size:20px; font-weight:bold; color:#000;\"\u003e\nBrief Benefit Bullets\n\u003c\/div\u003e\n\n\u003cul style=\"font-size:20px; color:#000; line-height:1.55; margin:0 0 32px 34px;\"\u003e\n\u003cli\u003eHelps build \u0026amp; maintain strong bones and teeth*\u003c\/li\u003e\n\u003cli\u003eVitamin D supports calcium absorption \u0026amp; bone mineralization*\u003c\/li\u003e\n\u003cli\u003eMagnesium supports bone formation \u0026amp; muscle function*\u003c\/li\u003e\n\u003cli\u003eSynergistic mineral trio for daily skeletal wellness*\u003c\/li\u003e\n\u003cli\u003eSupports nerve conduction \u0026amp; normal muscle contraction*\u003c\/li\u003e\n\u003cli\u003eCalcium carbonate format—best taken with meals for absorption*\u003c\/li\u003e\n\u003cli\u003eSplit-dose friendly (≤500 mg per serving) to optimize uptake*\u003c\/li\u003e\n\u003cli\u003eMarine-derived oyster shell calcium from a trusted source*\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/lifesourcevitamins.com\/pages\/3rd-party-testing\" target=\"_blank\" rel=\"noopener\"\u003e\u003cstrong\u003e3rd-party lab tested for identity, potency \u0026amp; purity\u003c\/strong\u003e\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cdiv style=\"background:#f2f4f7; border:1px solid #d0d7de; border-radius:14px; padding:16px; margin:22px 0 12px 0; font-size:20px; font-weight:bold; color:#000;\"\u003e\nSuggested Use\n\u003c\/div\u003e\n\n\u003cp style=\"font-size:20px; color:#000;\"\u003e\nAdults take 2 Tabs daily with food and water, or as directed by your healthcare provider. For best absorption of calcium carbonate, take with meals and split larger daily amounts into two doses. If you have kidney disease or are on medications, consult your clinician.*\n\u003c\/p\u003e\n\n\u003cdiv style=\"background:#f2f4f7; border:1px solid #d0d7de; border-radius:14px; padding:16px; margin:22px 0 12px 0; font-size:20px; font-weight:bold; color:#000;\"\u003e\nProduct Specifications\n\u003c\/div\u003e\n\n\u003cp style=\"font-size:20px; color:#000;\"\u003e• Form — Tabs\u003c\/p\u003e\n\u003cp style=\"font-size:20px; color:#000;\"\u003e• Quantity — 100 Tabs per bottle\u003c\/p\u003e\n\u003cp style=\"font-size:20px; color:#000;\"\u003e• Active Ingredients — Oyster shell calcium (carbonate), magnesium, vitamin D₃\u003c\/p\u003e\n\u003cp style=\"font-size:20px; color:#000;\"\u003e• Free From — Gluten, dairy, soy, artificial colors\/preservatives\u003c\/p\u003e\n\u003cp style=\"font-size:20px; color:#000;\"\u003e• Quality — Third-party tested for identity, potency \u0026amp; purity\u003c\/p\u003e\n\n\u003cdiv style=\"background:#f3fff5; border:2px solid #2e9b4c; border-radius:14px; padding:14px; margin:22px 0; font-size:20px; color:#000;\"\u003e\n\u003cstrong\u003e3rd-Party Testing:\u003c\/strong\u003e Every batch is verified by independent labs for identity, potency, and purity (including heavy metals). \u003ca href=\"https:\/\/lifesourcevitamins.com\/pages\/3rd-party-testing\" target=\"_blank\" rel=\"noopener\"\u003eClick here to see our 3rd-party testing\u003c\/a\u003e.\n\u003c\/div\u003e\n\n\u003cp style=\"background:#0073cf; border-radius:14px; padding:14px; margin:22px 0; text-align:center; font-size:20px; color:#ffffff;\"\u003e\nLifeSource Vitamins — Proudly American — Since 1992\n\u003c\/p\u003e\n\n\u003cp style=\"text-align:center; margin:22px 0; font-size:20px; color:#000;\"\u003e\n*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.\n\u003c\/p\u003e\n\n\u003cp style=\"text-align:center; font-size:20px;\"\u003e\nOyster Shell Calcium + Magnesium + Vitamin D — supports bone health, calcium absorption, and muscle function; third-party tested quality. \u003cstrong\u003eClinically Studied Ingredients — NIH\/PubMed!*\u003c\/strong\u003e\n\u003c\/p\u003e","brand":"LifeSource Vitamins","offers":[{"title":"100 Tablets","offer_id":45427827966091,"sku":"OYST001","price":11.99,"currency_code":"USD","in_stock":true},{"title":"200 Tablets VALUE SIZE","offer_id":45427827998859,"sku":"OYST002","price":19.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0709\/4409\/6395\/files\/31.png?v=1771444924","url":"https:\/\/lifesourcevitamins.com\/products\/oyster-shell-calcium-w-magnesium-vit-d-3-tablets","provider":"LifeSource Vitamins","version":"1.0","type":"link"}